Drip sealing of tunnels in hard rock: A new concept for the design and evaluation of permeation grouting

被引：51

作者：

Butron, Christian ^{[1
]}

Gustafson, Gunnar ^{[1
]}

Fransson, Asa ^{[1
]}

Funehag, Johan ^{[1
]}

机构：

[1] Chalmers Univ Technol, Dept Civil & Environm Engn, Div Geoengn, SE-41296 Gothenburg, Sweden

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY | 2010年 / 25卷 / 02期

基金：

瑞典研究理事会;

关键词：

Grouting design; Grouting evaluation; Dripping; Hard rock; Cement; Silica Sol;

D O I：

10.1016/j.tust.2009.09.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents a new pre-excavation grouting concept to prevent dripping and reduce the inflow into a railway tunnel. For this purpose, the tunnel's roof was drip-sealed using colloidal silica and the walls and invert of the tunnel were grouted with cement. The grouting design process followed a structured approach with pre-investigations of core-drilled boreholes providing parameters for the layout. Water pressure tests and pressure volume time recordings were used for the evaluation. Results showed that the design was successful: the total transmissivity was reduced from 4.9 x 10(-08) m(2)/s to the measurement limit (1.6 x 10(-08) m(2)/s), and the dripping was reduced to eight spots from the roof. Improved rock characterisation showed that the grout hole separation was within the transmissivity correlation length and that grouting efficiency depends to a large extent on the dimensionality of the flow system of the rock mass. (c) 2009 Elsevier Ltd. All rights reserved.

引用

页码：114 / 121

页数：8

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